Using Legacy features in Heretic maps

This is a collection of miscellaneous facts about the advanced Doom Legacy features and which ones work with Heretic, and which combinations do not work.


 * All legacy special linedefs work in Heretic mode too, and will be applied as long as they do not directly conflict with a Heretic sector or action that is specified by another method. In most cases such conflict will result in a sector attribute of one being overwritten by the other.
 * 3D floors are allowed.
 * Legacy water (Linetypes 301, 304) sectors work. However, applying such to a sector with Heretic water, is a sector model type collision (water renders properly but is not swimmable).
 * Wind attributes (Sector Types 40-51) do not transfer from the Legacy Control sector (such as for Legacy water and 3D floor) to the target sectors. Heretic wind must be applied directly to the target sectors.
 * Heretic special sectors are applied to the player, and special sectors from other modes are not.
 * Using Fast Strobe Death Slime will become Heretic Scroll East Lava Damage, due to wad id conflict.
 * Heretic doomednum conflict with Doom doomednum. However Legacy objects NODE, CAMERA, MBF DOGS, PUSH, PULL, are outside that range and should work.
 * Heretic maps are allowed to use fully capable SWITCHES lump (since 1.46).
 * Heretic DeHackEd supported.
 * Respawn and deathmatch.
 * Almost all menu game options apply in Heretic wads too.
 * Dogs will not be friendly as that is MBF behavior, and will be invisible unless a dog sprite wad is specified.